"First we heard the explosion and then all the doors down there shook like they were fixing to come off and everything. And then another explosion took place and I mean it was just pandemonium," he told Reuters.

"People running in and out of the buildings and everything else. And then a few minutes later there was another explosion. I just hope nobody got hurt."

A second unidentified witness said his entire truck shook from the blasts.

"I slowed down to see what it was and when it exploded my whole wrecker shook," he said.

"I got a big truck wrecker and the whole thing shook and rocked and it was pretty intense."